If you don't trust the tool, don't use it. The fact that '[b]ypassing censorship is a criminal activity in a number of countries' seems to be what drove the creator of this tool to its creation so I assume that he will not report you for 'bypassing censorship'. This does not mean it is impossible of course, a smart Erdolf-follower could make a similar tool (or even this one) with the purpose of catching those who try to escape censorship. In the end it comes down to trust, no matter which tool you use.